外文翻譯---數(shù)控機(jī)床開環(huán)控制伺服系統(tǒng)

1、<p>　　The open system merit of Computer Numerical Control</p><p>　　The open system merit is the system simple, the cost low, but the shortcoming is the precision is low. The reverse gap, the guide screw

2、 pitch error, stop inferiorly can affect the pointing accuracy by mistake. Following several kind of improvements measure may cause the pointing accuracy distinct improvement.1. reverse gap error compensates The num

3、erical control engine bed processing cutting tool and the work piece relative motion is depends upon the drive impetus gear,the guide screw rotat</p><p>　　A kind of storehouse by transfers for the designer.

4、Like this in the components design stage, the designer only must input the characteristic the parameter, the system direct production characteristic example model: We must save the related characteristic class in the dat

5、abase the structure information, the database table collection are use in saving this part of related information. According to the characteristic type definition need, we defined the characteristic class code table, the

6、 charact</p><p>　　3. feedbacks compensates the open-loop control</p><p>　　Chart 2 has produced this kind of system schematic diagram. This system surveys two parts by the open-loop control and t

7、he induction synchromesh direct position to be composed. Here position examination does not serve as the position the feedback, but is compensates the feedback as the position error. Its cardinal principle is: Installs t

8、he instruction pulse by the engine bed numerical control which CNC sends out, on the one hand the supplies open system, the control step-by-steps the electrical</p><p>　　數(shù)控機(jī)床開環(huán)控制伺服系統(tǒng)</p><p>　　開環(huán)

9、系統(tǒng)的優(yōu)點是系統(tǒng)簡單、成本低，但缺點是精度不高。反向間隙、絲杠螺距誤差、起停誤差等都會影響定位精度。下面幾種改進(jìn)措施可以使定位精度明顯改善。1 反向間隙誤差補(bǔ)償 數(shù)控機(jī)床加工刀具與工件的相對運(yùn)動是依靠驅(qū)動裝置帶動齒輪、絲杠轉(zhuǎn)動，從而推動工作臺面等移動部件產(chǎn)生位移來實現(xiàn)的。作為傳統(tǒng)元件的齒輪、絲杠盡管制造精度很高，但總免不了存在間隙。由于這種間隙存在，當(dāng)運(yùn)動的方向改變時，開始段時間必然會引起驅(qū)動元件的空走，出現(xiàn)指令脈沖推不動執(zhí)行

10、元件的局面。這就影響了機(jī)床的加工精度，即指令脈沖與實際進(jìn)給步數(shù)不相符合，產(chǎn)生加工誤差 因此，開環(huán)數(shù)控系統(tǒng)一般都設(shè)置有反向間隙誤差補(bǔ)償功能，用以補(bǔ)足空走的步數(shù)反向間隙差補(bǔ)償就是首先實測反向進(jìn)給的誤差，把它折算成脈沖當(dāng)量數(shù)，作為間隙補(bǔ)償子程序的輸出量，當(dāng)計算機(jī)判斷出現(xiàn)的指令為反向運(yùn)動時，隨即調(diào)用間隙補(bǔ)償子程序，通過輸出補(bǔ)償脈沖消除反向間隙后再進(jìn)行正常的插補(bǔ)運(yùn)行。2 常值系統(tǒng)性定位誤差補(bǔ)償 類庫以供設(shè)計者調(diào)用。這樣在零件的設(shè)計階段，